Japan - Skywatch websites are citing an official Chinese news agency report that a breakaway craft from a Mount Fuji UFO fleet was prevented from contacting Emperor Akihit-ho last week.
Flypast witnesses described the entity as entirely benign amid Japanese Air Farce paranoia that alien hieroglyphs on its fuselage spelled out the names Enola Gay and Little Boy.
The craft was videoed over the Aokigahara forest in Mount Fuji's foothills, a traditional Japanese suicide location.
Its 4 March New Moon sighting is believed by many as being a thwarted attempt to warn Akihit-ho about the 8.9 magnitude Sendai quake one week later.
Media footage of a vast swirling eddy in the Sea of Japan last Friday may now be investigated following reports the UFO's pre-tremor reconnaissance mission was shot down on Japanese generals' orders.
"That swirling whirlpool is a classic," the Doomsday Skywatch website commented.
"If you magnify the imagery by a factor of 10 you can just make out the craft's spiraling descent into the ocean following the JAF's rocket attack."
As for the alien hieroglyphs they are a complete misnomer a Cydonia Institute for Linguistics professor said today.
A rough and ready translation on Dr Einstein Flintstone's Farcebook entry says one of the fuselage characters is an alien figure '4' - considered lethal because it is pronounced in the same way as the Japanese word for death - Shi.
"Except that the '4' was part of a catchy little motto," Flintstone explained.
"My reading of it says Bong Hits 4 Akhit-ho - a classic ET message similar to an 'SOS'."
The original 1945 Boeing B-29 Superfortress bomber is on display at the Smithsonian.